ISHS Acta Horticulturae 179: V International Symposium on Growth Regulators in Fruit Production
GROWTH RETARDATION OF SHOOT AND PEEL GROWTH IN CITRUS BY PACLOBUTRAZOL |
| Author: | Shaul P. Monselise |
| Abstract:
Many processes connected with citrus growth and productivity are affected by native gibberellins and can be controlled by GA3 applications supplementing existing internal levels. The use of gibberellin synthesis inhibitors (=retardants) is less direct and depends on adaptation to time and site of gibberellin synthesis. Paclobutrazol (PB) seems to be better suited to citrus tissues than previously tried retardants. It operates at lower concentrations and it is the first which has shown significant action on shoot elongation, reducing by 55% total growth and by 25% internode length of summer shoots of young clone 'Minneola' tangelo trees when sprayed at 500 or 1 000 ppm. Moreover, fruit size and peel roughness of 'Topaz' tangor have been reduced by 16–33% and 37–42% respectively by 750–1 250 ppm sprays or by soil applications of 5.6 g/tree. Additional uses of PB on citrus are being studied. | |
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